I used some steel wire for my cabanes on my Citabria Pro. I wrapped it very tightly first, then saturated with flux, and soldered it together. No flu like symptoms yet. I figure it was such a small solder point that as long as I don't breath in the smoke and stay far enough back, no problem.
Anyway, the joint is extremly strong, seems to have worked very well for me. The steel wire was the stuff left over from when I set up an electric fence around my yard to keep my dog from jumping the 5 ft. fence. As soon as he put his bigfoot paws up there, POW!!!.

Patriot